Swedging tool



April 30, 1968 F. R. WILSON SWEDGING TOOL Filed Jan. 14, 1965 INVENTOR. FRfl/VK R W/ASO V United States Patent 3,380,285 SWEDGING TOOL Frank R. Wilson, Memphis, Tenn., assiguor to Parker- Hannifin Corporation, Cleveland, Ohio, a corporation of Ohio Filed Jan. 14, 1965, Ser. No. 425,419 3 Claims. (Cl. 72-477) ABSTRACT OF THE DISCLOSURE A tool for swedging tubes comprising a body for receiving hammer blows and one or more die sections removably attached directly to the body and having anvil portions for expanding the ends of tubes.

This invention relates to swedging tools for expanding the end of a piece of tubing, and more particularly, to a tool having a multiple of anvils of different sizes for swedging tubes of various sizes.

Heretofore it has been the practice to have a separate complete swedging tool for each size of tubing. The present invention provides a tool having a plurality of punches providing various sized anvils, the punches being capable of assembly into a single unit in which the larger size anvils are exposed for use and with the punches selectively removable from the assembly to expose smaller size anvils for use. The invention provides a very compact arrangement in which a single head member is utilized for receiving hammer blows regardless of which punch and anvil is being used.

An object of the invention is to provide a compact swedging tool for swedging tubes of various sizes.

Another object is to provide a swedging tool of the type described in which a series of punches providing swedging anvils of varying sizes can be attached to a single body or head member for receiving hammer blows for swedging the tubes.

Other objects of the invention will be apparent from the following description and from the drawing in which:

FIGURE 1 is a side view, partly in section, showing the completely assembled tool, and

FIGURE 2 is a side view of the tool with two of the punches carrying larger size anvils removed so as to expose a punch for use that has smaller size anvils.

The tool includes a body having a threaded section 11 at one end and a rounded surface 12 at its other end. Threaded section 11 has an external thread 13 with a transverse shoulder 14 adjacent its inner end and has an internal thread 15 with a transverse shoulder 16 at its outer end. Intermediate its ends body 10 has a non-circular portion 17 to provide a wrench gripping surface.

Threaded into internal thread 15 is a first punch 20 having an upper transverse shoulder 21 in engagement with shoulder 16.

Telescoped over first punch 20 is a hollow second punch 24 threaded onto external thread 13 with its upper end surface 25 in contact with shoulder 14. Punch 24 also has a non-circular wrench gripping portion 26 and an external threaded extension 27 terminating in a transverse shoulder 28.

A third hollow punch 30 is telescoped over punch 24 and threaded onto extension 27 with its upper end surface 31 in contact with shoulder 28. This punch also has a non-circular wrench gripping portion 32.

As illustrated, each of the punches has two or more sWedging sections, each section being for a tube of a particular size. Punch 30 has two swedging sections general- 1y designated 33 and 34, 33 being for the largest size tube that the tool is designed to accommodate and section 34 being for the second largest.

3,380,285 Patented Apr. 30, 1968 The swedging sections on all of the punches are similar except for size. Thus, swedging section 34 on punch 30 is for use with a tube 35 of a particular inside diameter and a particular outside diameter. Swedgin-g section 34 includes a cylindrical pilot portion 36 having a diameter approximately the same as the inside diameter of tube 35, a tapered forming portion 37 and a cylindrical anvil or sizing portion 38 whose diameter is a few thousandths of an inch larger in diameter than the outside diameter of tube 35 so that the inside diameter of the expanded p rtion 39 of the tube will be just large enough to snugly receive the unexpanded end of another tube having the same outside diameter as tube 35. Anvil portion 38 terminates at a transverse shoulder 40 that serves as a stop to limit the amount which die section 34 may enter tube 35.

Anvil 38 has a shallow narrow groove 42 therein that is located from the lower end of pilot portion 36 the same distance that tube 35 should project above a split tube holding block 44 prior to the swedging operation. The manner of utilizing gauging groove 42 for this purpose is more fully disclosed and claimed in Patent 2,915,107.

Die section 33 of punch 30 is for a tube larger than tube 35 and it has a cylindrical pilot portion 46 whose diameter is substantially the same as the inside diameter of the larger tube, a tapered forming portion 47 and a cylindrical anvil 48 that terminates as a transverse stop surface 49 and has a gauging groove 50 spaced from shoulder 40 the proper distance that the larger tube should project from holding die 44.

Punch 24 has three die sections generally desi nated 54, and 56 and punch 20 has two die sections generally designated 57 and 58. These die sections are similar to those on punch 30 except for size.

To utilize the tool for expanding the end of a tube 35 having a diameter as shown, the tool parts are assembled as shown in FIGURE 1 and the lower end 40 of die section 34 is placed on the upper surface 45 of holding block 44. Tube 35 is then inserted in the holding block until its upper end is in alignment with gauge groove 42 and then split blocks 44 are tightened against the tube to hold it firmly in place. Pilot portion 36 is then inserted into the end of tube 35 and hammer blows are applied to end surface 12 to drive die section 34 into the end of the tube until the end of the tube contacts shoulder 40 to limit the amount which die member 34 may enter the tube. In driving the tool into the tube in this manner, the tapered forming section 37 expands the end of the tube and cylindrical anvil 38 sizes the expanded portion as aforesaid. As the tool is driven into the tube, the hammer blows on surface 12 are first transmitted to punch 24 by shoulder 14 and'then to punch 20 by shoulder 28 of punch 24.

When it is desired to expand a tube 60 of a size corresponding to die section 58 of punch 20, punches 24 and 30 are removed from the tool by unthreading punch 24 from threaded extension 11 so that punch 20 is exposed as shown in FIGURE 2. Punch 20 is then placed so that the lower edge 61 of pilot section 62 is on the upper surface of holding block 44 and the tube is extended through the latter until its end is in alignment with gauge groove 63. The lower portion of punch 20 is then inserted into the tube until pilot portion 62 has completely entered the same, as shown in FIGURE 2. Hammer blows are then applied to surface 12 for driving punch 20 into the tube so that tapered surface 64 and anvil 65 expand and size the same and until the end of the tube contacts shoulder 66 to prevent further entry of the tool into the tube.

Similarly, when it is desired to expand a tube corresponding to the size of either die sections 54, 55 or 56, only punch 30 is removed from the completely assembled tool so as to expose punch 24. The tool is then used in the manner already described.

In one modification of the tool, die member 20 may be formed integrally with body 10, thus eliminating the threaded connection 15 therebetween. Other changes may also be made in the detail construction of the tool without departing from the scope of the invention as defined by the claims.

I claim:

1. A swedging tool for expanding the ends of tubes comprising a body having a surface at one end for receiving hammer blows and having a first punch at the other end, said first punch having a die section for expanding a tube of predetermined diameter when driven thereinto, a hollow punch telescoped over the first punch to completely enclose the same and removably attached directly thereto, said hollow punch having a die section for expanding a tube of a larger size than said predetermined size when driven thereinto, said hollow punch being attached directly to the first punch and removable therefrom to expose the latter for use.

2. The tool of claim 1 in which the body carries a third punch completely enclosed by the first punch, said first punch having a detachable connection with the body whereby said first punch and hollow punch are removable as a unit from the body to expose the third punch for use.

37 The tool of claim 2 in which the connection between the first punch and body is by means of an internal thread on the first punch engaged with an external thread on the body, and the third punch is detachably connected to the body by an external thread on the third punch engaged with an internal thread on the body.

References Cited UNITED STATES PATENTS 12/1959 Wilson 72-46l 1/1965 Kennedy 72477 

